The cancellation of the 'file' dialog box and handle errors caused by the empty path that makes the DB connection
Hi guys.
I developed a VI that connects to the database reads the names of tables, columns of the selected table, etc. It works well as I want to.
However, I have problem with identifying the UDL file with function of dialog 'file' use in a structure of the event that is triggered when the button 'Open' value is changed. It also works well, when I choose the UDL file, but the problem is when I cancel it and I get the error 43.
I tried to deal with this problem with a "error handler" function to clear the error 43 but the next errors that are associated with the database conncetion appeared. The reason is, when file dialog is cancelled, an empty path passes by reference of connection and I can't start the while loop where are the key codes. I also used a box Structure connected to "Cancelled" with 'DB connection tool' in case of real and connection the reference connection for the while loop, but I get the same result.
I want to apply for work as: start to push the button "Open" and select the file UDL, the loop run to establish the connections database, if not with the cancellation of the file dialog box, the application waits by pushing the button open and select the UDL file again.
Thanks a lot for your help in advance.
Hi lman,.
start to push the button "Open" and select the file UDL, the loop run to establish the connections database, if not with the cancellation of the file dialog box, the application waits by pushing the button open and select the UDL file again.
Some pseudocode, easy to implement:
WHILE onevent(OPEN button) FileDialog IF file selected THEN open database do calculations ELSE do nothing ENDIF WEND
What is your problem with the help of loops and structures of the case?
Tags: NI Software
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